Spring 2010 Exam 2 p. 1 BIO 311c Brand BIOLOGY 311C - Brand Spring 2010 NAME (printed very legibly) ____________________ Key ________________ UT-EID ________________ EXAMINATION II Before beginning, check to be sure that this exam contains 8 pages (including front and back) numbered consecutively, and that you have been provided with a clean Answer Sheet. Then immediately print your name and UT-EID legibly at the top of this page. Also print and bubble in your name and your UT-EID (not your social security number) on the front of the Answer Sheet in the spaces provided. The first 43 questions are “multiple choice”, with only one correct answer. Mark the letter corresponding to the correct answer to each of these questions in the appropriate location on the Answer Sheet, using a No. 2 pencil. Write answers to Questions 44 - 46 directly on this exam, in the spaces provided with the questions. Write in complete sentences if an explanation is required and print neatly if your handwriting is likely to be difficult to read. Turn in both this exam and the Answer Sheet after checking to be sure that your name is clearly written in both places and all questions have been answered in the appropriate locations. You must turn in your exam on or before 9:55 a.m. 1. Which one of the following is not an information molecule of living cells? a. DNA b. RNA c. polysaccharide d. polypeptide 2. Approximately what portion of the dry weight of a typical living cell consists of organic molecules? a. 0.35% b. 1 % c. 70% d. 99% 3. The bond angle of a molecule of water is closest to which one of the following? a. 180° b. A tetrahedral angle c. The angles of a regular hexagon d. A right angle 4. Polar bonding causes a hydrogen atom that is covalently bonded to a nitrogen atom to be most strongly attracted to which one of the following? a. A negatively-charged surface of a nearby membrane b. A positively-charged domain of a nearby protein molecule c. A methyl functional group on a nearby lipid d. A sulfhydryl functional group on the same molecule that contains the hydrogen bonded to nitrogen 5. Consider the molecule whose partial structure is illustrated at right. How many electric charges would this structure be expected to carry at pH 5.0? a. 0 b. 1 c. 2 d. 3

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Spring 2010 Exam 2 p. 2 BIO 311c Brand 6. Which one of the following is shown in the molecule whose partial structure is illustrated at right? a. A peptide bond b. Hydrophobic bonding (interaction) c. A hydrogen bond d. A carboxylic acid functional group 7. In pure water at pH 7, the [OH-] is: a. approximately 0. b. approximately 14.

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